en.wikipedia.org/wiki/Standard_deviation

In statistics, the standard deviation is a measure that is used to quantify the amount of variation or dispersion of a set of data values. A low standard deviation ...

www.mathsisfun.com/data/standard-deviation.html

The Standard Deviation is a measure of how spread out numbers are. Its symbol is σ (the greek letter sigma). The formula is easy: it is the square root of the ...

www.khanacademy.org/math/statistics-probability/displaying-describing-data/sample-standard-deviation/v/statistics-standard-deviation

Learn how to calculate standard deviation, how it relates to variance and mean, and the difference between population and sample standard deviation.

www.robertniles.com/stats/stdev.shtml

A simpler explanation of standard deviation, written by a former math-major- turned-journalist who likes to explain math to people don't understand or just plain ...

www.investopedia.com/terms/s/standarddeviation.asp

Standard deviation is a measure of the dispersion of a set of data from its mean. It is calculated as the square root of variance by determining the variation ...

www.calculator.net/standard-deviation-calculator.html

Free online tool to calculate the standard deviation, variance, mean, sum, and confidence range for given numbers. Also find hundreds of other free online ...

mathworld.wolfram.com/StandardDeviation.html

Physical scientists often use the term root-mean-square as a synonym for standard deviation when they refer to the square root of the mean squared deviation of ...

www.statisticshowto.com/what-is-standard-deviation

Nov 10, 2012 ... Standard deviation explained in plain English. How to find it by hand or using technology. Standard deviation symbol. Free help forum.